(760 ILCS 100/21)(from Ch. 21, par. 64.21)Sec. 21. Except as otherwise provided for in this Act, whenever the
Comptroller is required to give notice to any applicant or licensee,
such requirement shall be considered complied with if, within the time
fixed herein, such notice is enclosed in an envelope plainly addressed
to such applicant or licensee, as the case may be, United States postage
fully prepaid, and deposited, registered, in the United States mail.(Source: P.A. 78-592.)